Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Percentage of Weighted Average Cost Inventory		47.00%	43.00%
Impairment of Long-Lived Assets Held-for-use			$ 0	$ 0
Goodwill, Impairment Loss	$ 128,938	$ 61,142	80,337	0
Indefinite-Lived Intangible Assets (Excluding Goodwill)		0
Impairment of Intangible Assets, Finite-lived		59,786	0	0
Product warranty reserves		10,154	8,755
Foreign currency transaction gains		(12)	1,616	422
Research and Development Expense		3,511	3,937	$ 3,096
Non-Domestic [Member]
Certificates of Deposit, at Carrying Value		16	1,939
Cash, Cash Equivalents, and Short-term Investments		$ 29,400	$ 29,700
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life		25 years
Maximum [Member] | Buildings [Member]
Property, Plant and Equipment, Useful Life		40 years
Maximum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment, Useful Life		10 years
Maximum [Member] | Leasehold Improvements [Member]
Property, Plant and Equipment, Useful Life		13 years
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life		5 years
Minimum [Member] | Buildings [Member]
Property, Plant and Equipment, Useful Life		5 years
Minimum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment, Useful Life		2 years
Minimum [Member] | Leasehold Improvements [Member]
Property, Plant and Equipment, Useful Life		3 years
Weighted Average [Member]
Finite-Lived Intangible Asset, Useful Life		15 years